Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ce7978075559ad…

MALICIOUS

PDF

68.3 KB Created: 2021-03-10 07:20:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dfcce480ce00bc1ad0ff9b24ad951078 SHA-1: d35c19775468ca93dbc605d915ccd050bfd50b63 SHA-256: 41ce7978075559adc1ee6c3de24ac29039c8042e2ab22a36d6ec8f602d6c9f52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though truncated and partially corrupted, contains text related to 'changing pdf to word document online', which serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/123?utm_term=changing+pdf+to+word+document+online PDF link annotation
    • http://topplafond.xyz/mugosajexv7a1j.pdfIn PDF document text
    • http://tugrull.com/how_to_calibrate_forehead_thermometerdvc6w.pdfIn PDF document text
    • http://narosisebono.22web.org/vyapari_mitra.pdfIn PDF document text
    • http://lelonul.iblogger.org/sajaxidu.pdfIn PDF document text
    • http://udilische.club/fagosmm3a0.pdfIn PDF document text
    • http://stroy-level.ru/bohemian_rhapsody_trumpet_sheet_musicsdu2k.pdfIn PDF document text
    • http://hempmap.ru/bufferedimage_to_com._itextpdf._text._imagesddxz.pdfIn PDF document text
    • http://betmoy56.com/dudikijev3dht.pdfIn PDF document text
    • http://sdfafq.info/golusimf86nd.pdfIn PDF document text
    • http://zorexodepa.iblogger.org/video_er_app_for_windows_xp.pdfIn PDF document text
    • http://latencfsrt.space/mabusa3wdp0.pdfIn PDF document text
    • http://arendaavto.taxi/845330732756vujd.pdfIn PDF document text
    • http://cucoupon.info/45398398019jt8x9.pdfIn PDF document text
    • http://air-calm2.club/80702208443srcxo.pdfIn PDF document text
    • http://vizimuvorogo.22web.org/ladef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/34347396179.pdfIn PDF document text
    • http://vufigenetusanu.epizy.com/maytag_bravos_mct_washing_machine_manual.pdfIn PDF document text
    • http://tokuloxigov.epizy.com/balance_sheet_components.pdfIn PDF document text
    • http://bozomeza.rf.gd/careless_whisper_easy_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/kazivo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBC 5388 bytes
SHA-256: 4eb90f66d7fc6800e6fa97d5240051fdd3f62721ddf350353e7f743fe904c0fb
font_01_sfnt_off0000e0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 10248 bytes
SHA-256: 74298d010cff5375df31b01291ca4962442991f5811917eab2d40740b742cdd9

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